Add rating level for talk

[pxlpnk]

Add a drop down that has the following elements:

• Beginner
• Intermediate
• Advance

(maybe more fine grain)

[bitboxer]

Don't we have that already with the beginner friendliness?

[hagenburger]

That should be selected by the person submitting the talk.

[bitboxer]

Ah, then I misunderstood this